Originally posted by: DrPizza
To everyone who suggested he park in front of his own house:
Well, duuu-uuuh. You don't think he drove home and said to himself, "gee, I think I'll walk an extra 100 feet for exercise."
I'm pretty sure that spot was his closest option at the time.
OP: Your neighbor is an idiot for not realizing what I just posted above, and for leaving such a note. If you park there again, there's always the chance that the neighbor will key your car.
Solution: Go to craigslist. Find a junker for about $200 that'll pass inspections. Register it and park it on the street in front of the other person's house. If there's some sort of 24 hour rule in effect in your town/village/city, purchase a second $200 junker. Then, just swap them once a day.

If you've got a few grand to spare, you can increase your level of personal satisfaction by not allowing your neighbor to park within a block of his own home. And, with luck, once you've decided your neighbor learned his lesson about who owns the road, you might get lucky and sell that $200 car for $300 and actually end up with a profit!